package cn.edu.scau.cmi.suwenpeng.chapter09;

public class Exercise6 {

	public static void main(String[] args) {
		String s1,s2;
		s1=new String("ABCDEFG");
		s2=new String("abcdefg");
		String s=s2.toUpperCase();
		System.out.println(s);
		s=s1.toLowerCase();
		System.out.println(s);
		s=s1.concat(s2);
		System.out.println(s);
	}

}
